CVE-2026-45390
Critical
Description
In OCaml-tar before 3.4.0, a crafted archive with ../ path segments in its name allows escaping the current working directory. This is not desired behavior, and tar(1) rejects such extractions, but ocaml-tar decompresses it anyway. The impact is that it allows arbitrary file writes outside of the desired extraction directory (to an attacker that can reach a tar decompression endpoint).
SeverityCritical
CVSS9.1
Exploit probability—
ProductOCaml-tar
PublishedJun 15, 2026
First seenJun 15, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- OCaml-tar3.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| OCaml-tar | No range specified | 3.4.0 |
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